Jeep Cherokee 2.SL • Cherokee 4.0L • Comanche 2.SL • Comanche 4.0L • Grand Cherokee 4.0L • Grand Cherokee S.2L • Wrangler 2.SL • Wrangler 4.0L OBD1 Codes

Model	Year	Engine identification	System
Cherokee 2.SL	1992-95	VIN position 8 =P	JTEC
Cherokee 4.0L	1992-95	VIN position 8 =S	JTEC
Comanche 2.SL	1992	VIN position 8 =P	JTEC
Comanche 4.0L	1992	VIN position 8 =S	JTEC
Grand Cherokee 4.0L	1993-95	VIN position 8 =5	JTEC
Grand Cherokee S.2L	1993-95	VIN position 8 =Y	JTEC
Wrangler 2.SL	1992-95	VIN position 8 =P	JTEC
Wrangler 4.0L	1992-95	VIN position 8 =5	JTEC

General information

Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded .
ECM operates in backup mode if sensors fail , to enable vehicle to be driven to repair shop.
Trouble codes can be displayed by the MIL or by using a Scan Tool connected to the data link connector (OLC)

Accessing

Within 5 seconds switch the ignition key ON-OFFON-OFF-ON.
Count MIL flashes. Note trouble codes.
Each trouble code consists of two groups 0 [A].
The first group of flashes indicate the ‘tens’ of the trouble code.
The second group of flashes indicate the ‘units’ of the trouble code.
A short pause separates ‘tens’ and ‘units’ 0 [B].
A long pause separates each trouble code 0 [C].
For example: Trouble code 21 displayed 0.
End of test sequence indicated by trouble code 55.
Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (OLC):
- Cherokee/Comanche fl
- Grand Cherokee l!l
- Wrangler 9

Erasing

NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.

Ensure ignition switched OFF.
Disconnect battery ground cable for at least 30 seconds.
Reconnect battery ground cable.
Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.

NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio. Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC).

Flash code	Fault location	Probable cause
11	Crankshaft position (CKP) sensor	Wiring, air gap, CKP sensor
12	Engine control module (ECM) -supply voltage disconnected within last 50ignition switch ON-OFF cycles	Wiring, battery
13	Manifold absolute pressure (MAP) sensor	Wiring, MAP sensor
14	Manifold absolute pressure (MAP) sensor voltage low/high	Wiring, MAP sensor
15	Vehicle speed sensor (VSS) -signal	Wiring, VSS
17	Engine temperature -low for long period	Wiring, coolant thermostat, ECT sensor
21	Heated oxygen sensor (H02S) -incorrect signal/voltage high	Wiring, fuel pressure, injector control,EVAP canister purge valve, compression, air filter blocked, H02S
22	Engine coolant temperature (ECT) sensorvoltage low/high	Wiring, ECT sensor
23	Intake air temperature (IAT) sensor -voltage low/high	Wiring, IAT sensor
24	Throttle position (TP) sensor -voltage low/high	Wiring, accelerator cable adjustment, TP sensor
25	Idle air control (lAC) valve	Wiring, lAC valve
27	Injector(s) -circuit malfunction	Wiring, injector
31	Evaporative emission (EVAP) canister purge valve -open/short circuit	Wiring, EVAP canister purge valve
32	Exhaust gas recirculation (EGR) solenoid/system -circuit malfunction	Wiring, hoses, EGR solenoid
33	AlC compressor clutch reiay/AICrefrigerant pressure sensor -voltage low/high	Wiring, AlC compressor clutch relay, AlC refrigerant pressure sensor
34	Cruise control	Wiring open circuit/short circuit, hoses, voltage low/high, cruise control master switch, cruise control vacuum switching valve
35	Engine coolant blower motor relay -low/high speed	Wiring, engine coolant blower motor relay low/high speed
37	Torque converter clutch (TCC) solenoidcircuit malfunction	Wiring, TCC solenoid
41	Alternator	Wiring open circuit/short circuit, alternator
42	Engine control relay	Wiring open circuit/short circuit, engine control relay
44	Battery temperature sensor/engine coolant temperature (ECT) sensor	Wiring open circuit/short circuit, battery temperature sensor, ECT sensor, ECM
45	Overdrive solenoid	Wiring open circuit/short circuit, overdrive solenoid
46	Alternator -voltage high	Wiring, battery, alternator
47	Alternator -voltage low	Wiring, battery, alternator drive belt, alternator
51	System too lean	Wiring, intake/exhaust leak, fuel pressure, injector control, EVAP canister purge valve, H025
52	System too rich	Wiring, exhaust blockage, fuel pressure, injector control, EVAP canister purge valve, compression, air filter blocked, ignition system, H025
53	Engine control module (ECM) -internal fault	ECM
54	Camshaft position (CMP) sensor -no signal	Wiring, CMP sensor
55	End of MIL code output	–
62	Engine control module (ECM) -EEPROM error	ECM
63	Engine control module (ECM) -EEPROM error	ECM
76	Fuel pump resistor	Wiring open circuit/short circuit, fuel pump resistor